linux-kernel - [PATCH] soc: bcm: brcmstb: pm: pm-arm: Fix refcount leak in brcmstb_pm

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Date:   Thu, 26 May 2022 11:53:22 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Broadcom Kernel Team <bcm-kernel-feedback-list@...adcom.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Kees Cook <keescook@...omium.org>,
        Helge Deller <deller@....de>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Miaoqian Lin <linmq006@...il.com>,
        Gareth Powell <gpowell@...adcom.com>,
        Brian Norris <computersforpeace@...il.com>,
        Doug Berger <opendmb@...il.com>,
        Justin Chen <justinpopo6@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] soc: bcm: brcmstb: pm: pm-arm: Fix refcount leak in brcmstb_pm_probe

of_find_matching_node() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.

In brcmstb_init_sram, it pass dn to of_address_to_resource(),
of_address_to_resource() will call of_find_device_by_node() to take
reference, so we should release the reference returned by
of_find_matching_node().

Fixes: 0b741b8234c8 ("soc: bcm: brcmstb: Add support for S2/S3/S5 suspend states (ARM)")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/soc/bcm/brcmstb/pm/pm-arm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/bcm/brcmstb/pm/pm-arm.c b/drivers/soc/bcm/brcmstb/pm/pm-arm.c
index 3cbb165d6e30..70ad0f3dce28 100644
--- a/drivers/soc/bcm/brcmstb/pm/pm-arm.c
+++ b/drivers/soc/bcm/brcmstb/pm/pm-arm.c
@@ -783,6 +783,7 @@ static int brcmstb_pm_probe(struct platform_device *pdev)
 	}
 
 	ret = brcmstb_init_sram(dn);
+	of_node_put(dn);
 	if (ret) {
 		pr_err("error setting up SRAM for PM\n");
 		return ret;
-- 
2.25.1